1 /* 2 * Copyright (C) 2015 Red Hat, Inc. 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the 14 * next paragraph) shall be included in all copies or substantial 15 * portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 26 #include <linux/dma-mapping.h> 27 #include <linux/moduleparam.h> 28 29 #include "virtgpu_drv.h" 30 31 static int virtio_gpu_virglrenderer_workaround = 1; 32 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400); 33 34 int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid) 35 { 36 if (virtio_gpu_virglrenderer_workaround) { 37 /* 38 * Hack to avoid re-using resource IDs. 39 * 40 * virglrenderer versions up to (and including) 0.7.0 41 * can't deal with that. virglrenderer commit 42 * "f91a9dd35715 Fix unlinking resources from hash 43 * table." (Feb 2019) fixes the bug. 44 */ 45 static atomic_t seqno = ATOMIC_INIT(0); 46 int handle = atomic_inc_return(&seqno); 47 *resid = handle + 1; 48 } else { 49 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); 50 if (handle < 0) 51 return handle; 52 *resid = handle + 1; 53 } 54 return 0; 55 } 56 57 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id) 58 { 59 if (!virtio_gpu_virglrenderer_workaround) { 60 ida_free(&vgdev->resource_ida, id - 1); 61 } 62 } 63 64 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo) 65 { 66 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 67 68 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 69 if (virtio_gpu_is_shmem(bo)) { 70 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo); 71 72 if (shmem->pages) { 73 if (shmem->mapped) { 74 dma_unmap_sg(vgdev->vdev->dev.parent, 75 shmem->pages->sgl, shmem->mapped, 76 DMA_TO_DEVICE); 77 shmem->mapped = 0; 78 } 79 80 sg_free_table(shmem->pages); 81 kfree(shmem->pages); 82 shmem->pages = NULL; 83 drm_gem_shmem_unpin(&bo->base.base); 84 } 85 86 drm_gem_shmem_free_object(&bo->base.base); 87 } else if (virtio_gpu_is_vram(bo)) { 88 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 89 90 spin_lock(&vgdev->host_visible_lock); 91 if (drm_mm_node_allocated(&vram->vram_node)) 92 drm_mm_remove_node(&vram->vram_node); 93 94 spin_unlock(&vgdev->host_visible_lock); 95 96 drm_gem_free_mmap_offset(&vram->base.base.base); 97 drm_gem_object_release(&vram->base.base.base); 98 kfree(vram); 99 } 100 } 101 102 static void virtio_gpu_free_object(struct drm_gem_object *obj) 103 { 104 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 105 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 106 107 if (bo->created) { 108 virtio_gpu_cmd_unref_resource(vgdev, bo); 109 virtio_gpu_notify(vgdev); 110 /* completion handler calls virtio_gpu_cleanup_object() */ 111 return; 112 } 113 virtio_gpu_cleanup_object(bo); 114 } 115 116 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = { 117 .free = virtio_gpu_free_object, 118 .open = virtio_gpu_gem_object_open, 119 .close = virtio_gpu_gem_object_close, 120 121 .print_info = drm_gem_shmem_print_info, 122 .export = virtgpu_gem_prime_export, 123 .pin = drm_gem_shmem_pin, 124 .unpin = drm_gem_shmem_unpin, 125 .get_sg_table = drm_gem_shmem_get_sg_table, 126 .vmap = drm_gem_shmem_vmap, 127 .vunmap = drm_gem_shmem_vunmap, 128 .mmap = drm_gem_shmem_mmap, 129 }; 130 131 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo) 132 { 133 return bo->base.base.funcs == &virtio_gpu_shmem_funcs; 134 } 135 136 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev, 137 size_t size) 138 { 139 struct virtio_gpu_object_shmem *shmem; 140 struct drm_gem_shmem_object *dshmem; 141 142 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); 143 if (!shmem) 144 return NULL; 145 146 dshmem = &shmem->base.base; 147 dshmem->base.funcs = &virtio_gpu_shmem_funcs; 148 dshmem->map_cached = true; 149 return &dshmem->base; 150 } 151 152 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev, 153 struct virtio_gpu_object *bo, 154 struct virtio_gpu_mem_entry **ents, 155 unsigned int *nents) 156 { 157 bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev); 158 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo); 159 struct scatterlist *sg; 160 int si, ret; 161 162 ret = drm_gem_shmem_pin(&bo->base.base); 163 if (ret < 0) 164 return -EINVAL; 165 166 /* 167 * virtio_gpu uses drm_gem_shmem_get_sg_table instead of 168 * drm_gem_shmem_get_pages_sgt because virtio has it's own set of 169 * dma-ops. This is discouraged for other drivers, but should be fine 170 * since virtio_gpu doesn't support dma-buf import from other devices. 171 */ 172 shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base); 173 if (!shmem->pages) { 174 drm_gem_shmem_unpin(&bo->base.base); 175 return -EINVAL; 176 } 177 178 if (use_dma_api) { 179 shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent, 180 shmem->pages->sgl, 181 shmem->pages->nents, 182 DMA_TO_DEVICE); 183 *nents = shmem->mapped; 184 } else { 185 *nents = shmem->pages->nents; 186 } 187 188 *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry), 189 GFP_KERNEL); 190 if (!(*ents)) { 191 DRM_ERROR("failed to allocate ent list\n"); 192 return -ENOMEM; 193 } 194 195 for_each_sg(shmem->pages->sgl, sg, *nents, si) { 196 (*ents)[si].addr = cpu_to_le64(use_dma_api 197 ? sg_dma_address(sg) 198 : sg_phys(sg)); 199 (*ents)[si].length = cpu_to_le32(sg->length); 200 (*ents)[si].padding = 0; 201 } 202 return 0; 203 } 204 205 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev, 206 struct virtio_gpu_object_params *params, 207 struct virtio_gpu_object **bo_ptr, 208 struct virtio_gpu_fence *fence) 209 { 210 struct virtio_gpu_object_array *objs = NULL; 211 struct drm_gem_shmem_object *shmem_obj; 212 struct virtio_gpu_object *bo; 213 struct virtio_gpu_mem_entry *ents; 214 unsigned int nents; 215 int ret; 216 217 *bo_ptr = NULL; 218 219 params->size = roundup(params->size, PAGE_SIZE); 220 shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size); 221 if (IS_ERR(shmem_obj)) 222 return PTR_ERR(shmem_obj); 223 bo = gem_to_virtio_gpu_obj(&shmem_obj->base); 224 225 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle); 226 if (ret < 0) 227 goto err_free_gem; 228 229 bo->dumb = params->dumb; 230 231 if (fence) { 232 ret = -ENOMEM; 233 objs = virtio_gpu_array_alloc(1); 234 if (!objs) 235 goto err_put_id; 236 virtio_gpu_array_add_obj(objs, &bo->base.base); 237 238 ret = virtio_gpu_array_lock_resv(objs); 239 if (ret != 0) 240 goto err_put_objs; 241 } 242 243 ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents); 244 if (ret != 0) { 245 virtio_gpu_free_object(&shmem_obj->base); 246 return ret; 247 } 248 249 if (params->blob) { 250 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params, 251 ents, nents); 252 } else if (params->virgl) { 253 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, 254 objs, fence); 255 virtio_gpu_object_attach(vgdev, bo, ents, nents); 256 } else { 257 virtio_gpu_cmd_create_resource(vgdev, bo, params, 258 objs, fence); 259 virtio_gpu_object_attach(vgdev, bo, ents, nents); 260 } 261 262 *bo_ptr = bo; 263 return 0; 264 265 err_put_objs: 266 virtio_gpu_array_put_free(objs); 267 err_put_id: 268 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle); 269 err_free_gem: 270 drm_gem_shmem_free_object(&shmem_obj->base); 271 return ret; 272 } 273